user
Write a response that appropriately completes the request.

### Instruction:
Explain what a "food desert" is and why they are a problem.

### Response:
assistant
A "food desert" is an area with little or no access to affordable, healthy food options. It is typically an urban area with a combination of high poverty and few supermarkets or other sources of healthy food. Food deserts lead to an array of health problems such as obesity, diabetes, and malnutrition due to the lack of access to fresh and nutritious food.